Airworthiness Directives; General Electric Company CF6-45/50 Series Turbofan Engines

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This document proposes the adoption of a new airworthiness directive (AD) that is applicable to General Electric Company (GE) CF6- 45/50 series turbofan engines. This proposal would require initial and repetitive inspections for cracks in the stage 14 high pressure compressor (HPC) disk lock slots, and removal from service of certain disks, at the first piece-part level or HPC rotor module level exposure, after 6,000 cycles since new (CSN). This proposal is prompted by reports of stage 14 HPC disk lock slot cracks discovered during shop fluorescent penetrant inspections. The actions specified by the proposed AD are intended to prevent stage 14 HPC disk failure, which could result in an uncontained engine failure and damage to the aircraft.